in tokyo, the city shook for several minutes, and in the north, you can see offices rattled, right there. thanks to an early warning system, though, residents had six minutes to take cover, even huddling in the subway at rush hour. it's been a year and a half since a 9.0 quake and the devastating tsunami. this time, the water rose only three feet. >>> and tonight, we have a winner coming out of the shadows. the second person holding the winning ticket to the $587 million powerball, about to step forward to claim his fortune in arizona. abc's ron claiborne has the clues to his identity. >> over half a billion dollar jackpot. >> reporter: mystery solved. well, kind of. >> the winner has asked to remain anonymous. >> reporter: but lottery officials did release a few tantalizing details. >> he is in his 30s. he is married. and he lives in fountain hills. >> reporter: he will share half of the $587 million top prize and has opted for the lump sum payment of $192 million. that's after paying upwards of $100 million in taxes. but much remains unknown. his job. does he have children? and, of cou